Piston.



I. W. BRUNSKILL.

PISTON.

APPLICATION FILED MAY 3, I915.

1 1 77,0 1 0 I Patented Mar. 28, 1916.

2 SHEETSSHEET l.

].,W. BRUNSKILL.

PISTON.

| N FILED MAY 3, 191

Patented Mar. 28, 1916.

Z SHEETSSHEET Z.

tI WBru 718% 1/! JAMES Wr BRUNSKILL, 0F DUBUQUEfIOWA. 1

' PISTON. '1

To allwhom it may concern y Be it known that I, JAMEsWV. BRUNSKILLQ a citizenof the United States, residing at.

Dubuque, in the county of Dubuque and State of Iowa,

and useful Improvements in Pistons and I do declare the following tobe a full, clear, andexactdsscription of the invention, such as will enable othersskilled 'in the art to which it appertains to make and use the same:

This invention relates to pistons generally and may be embodied in apiston to which power is applied and which in turn exerts its pressure upon a fluid, as ina pump "or compressor, or it may be embodied in apis ton upon which a fluid underpressure exerts its pressure and which -1Il turn: exerts its pressure upon some other part, as in an en-:'-

gine or other machine. I therefore desire to have it understood that the invention is not limited to the character of: the Imachine "on which the piston is used but that on -the contrary it'is concerned only with the construction of the piston itself."

The primary object of the invention is to provide a piston or plunger of thischaracter so constructed that a1o-='air oi -other fluid can possibly pass between the walls of the cylinder andthe periphery of theprston. Another object is to provide a sectional piston, the parts of which are constructed for interlocking engagement so that one cannot turn without the other, thus preventing the packing from getting out of place and which are provided with an auxiliary device for preventing leakage of fluid through the interlocking members of the piston.

vVith these and other objects inview, the invention consists of certain novel features of construction, and the combination and arrangement of parts as will be more fully described and claimed.

In the accompanyingdrawings: Figurel represents a side elevation of a piston con- 'structed in accordance with this invention;

Fig. 2 is a transverse section taken on the line 22 of Fig. 4:; F1g. 3 1s a similar View taken on the line 33 of Fig. 4; Fig. 4: is

a longitudinal central section thereof; Fig. 5 is a bottom planview of one of the members comprising this piston. Fig. 6 is a transverse section taken on the line 6-6 of Fig. 7; Fig. 7 is a top plan View of the Specification'of Letters Patent.

of Fig.8, and Fig. 10 have invented certaln; new

bers or heads- 2 and 3 periphery. with packingseatse and 5, the seat'of-one member registering with that a 1 ceive it. -This packing 7 may same member; Fig. 8 is a similar view of the other member of the piston; Fig. 9 is a transverse section taken on the line 99' is a bottom plan view of said member.

In the embodiment illustrated a piston 1 :is shown composed of two head sections 2 1 and 3 constructed in :the form shown in Fig. 4 andprovided with interlocking fin- 'gers 4. adapted to engage sockets 5 of the other member'so that when the parts are 1 assembled these-fingers and sockets will teles .scopically engage and thus reliably hold the against turning rela parts of the 1 piston tlvely to each other. These, piston menr are provided in their of the other to form when assembled a semicirculanrecess to receive a packing ring 7 which is of thesame cross sectional contour as the seat 6 which is designed to re be of any suitable or' desired construction andis held in therseat 6 bythe clamping together of the two members 2 and '3 whichis accomplished by meansof a threaded extension of. a rod 9, said 8 formed on the inner end extension 8 being passed centrally through portions-of the "members 2 and 3 and projecting beyond the outer face of the member 3 where it is secured by means of a hexagonal nut 1.0 threaded on said rod as is shown clearly in F ig. 4 and which when screwed up draws the two members 2 and 3 toward each other and thereby reliably clamps the packing 7 in its seat 6, compressing said packing and causing it to move outwardly into engagement with the cylinder in which the piston is mounted.

The member 8 has a longitudinally extend- Patented Mar. 28, 19116. Application filed. May '3, 1915. Serial No. 25,541. r

ing flange 11 arranged in alinement with the peripheral portion thereof and which is provided at its outer end wlth a reduced por tion 12 which latter is internally threaded adapted to be threaded into engagement therewith. This member 14 is provided at the base of said flange with an inwardly extending shoulder 16 which is arranged in alinement with the inner face of the flange the shoulder 13 of said flange 11 and the inner face of the flange 15 a packing seat 17 in which a gasket 18 is mounted and clamped to prevent all possibility of any fluid which might enter between the interlocking elements of the members 2 and 3 from passing out beyond the piston. This closure is provided on its outer face with a hexagonal nut-like projection 19 to receive a wrench for screwing and unscrewing said closure when assembling and disassembling the parts of the piston.

From the above description, it will be obvious that when the parts are assembled as described and thepiston mounted in a cylinder which it is adapted to fit no fluid can possibly pass between the periphery of said piston and th side walls of the cylinder, and should the packing become worn it may be adjusted to cause it to tightly engage the cylinder by forcing the members 2 and 3 together by screwing up the nut 10 on the rod 9 and thus reducing the width of said packing and consequently increasing its thickness, forcing it into engagement with the cylinder connection.

I claim as my invention:

1. A piston comprising two members having interlocking elements and each provided at its periphery with a packing seat, the seat in one member adapted to register with that in the other when the members are assembled, and means for securing said memwalls to produce a fluid tight at itsperiphery with a packing seat, the seat in one member adapted to register with that in the other when the members are assembled, means for securing said members together in relationto each other, one of said members having an annular flange at its outer end extending in longitudinal alinement with said member, said flange being reduced in thickness at its outer end and internally threaded, a shoulder formed at the base of said reduced flanged portion, and an end closure for said flange threaded into said threaded flanged portion, and a packing arranged between said shoulder and closure.

3. A piston comprising two members having telescopically engaging elements and each having a packing seat in the periphery thereof, saidseats being curved at their outer ends with the seat of one member registering with that of the other, means for adjusting said members toward and away from each other, packings arranged in said seats and conforming to the cross sectional contour thereof, and a closure mounted in the outer end of one of said members and having a fluid-tight engagement therewith,

In testimony whereof I have hereunto set my hand in presence of two subscribing Witnesses:

T; J. PAIsLnY, CHAS. MCIVIANUS.

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents,

Washington, D. 0. 

